Grinding machine



May 1. 1928. I

L. J. COONEY I GRINDING MACHINE Filed June 24, 1925 a Sheets-Sheet 1 m/ vawran May 1, 1928.

L. J. COONEY GRINDING MACHINE 3 Sheets-Sheet 2 Filed Jun; 24, 1925 Patented May 1, 1928.

Human; PATIENT o -rcs.

LA B. ENGE;J. COONEK 0i:- IT B K'PENN Y AN A, ASS QNQB ,TQ KEYSTONE .GRINDER.ANID.,MA.NUEACTURING CQMPANY, A CQBPQRATIONOF;PENNSXLYANIA.

QR ND NG MACHINE:-

'Application filedj'une 24,1925; Serial m 39,277.

The invention relates to grinding machines, and particularly to -machines for.

grinding the sawtooth sickle blades used upon mowersand-reapers. The machine in its preferred formcontemplates the use of an ordinary hand operated grinding wheel,

equipped with an attachment adapting it for the. particular use above recited, and designed'to be. used'for; all classes of grmdmg to which the ordinary disc type abrasivewheelis applied when theattachment is removed; but the invention is" notlimited to this transformation featureor-tothe use of a hand driven wheel; V

The inventionhasfor its objects the provision Oftt simple constrruztionwhich can be sold at; a low price, and whichcan be used by the purchaser, who lSzIlOi] a skilled mechanic, to quickly, andaccurately sharpen saw tooth sickles whichhave become dulled in service, More specifically, it. has for its objects the provision of improved means for adjusting, clamping and supporting the sickle bar in position forthe successive grinding operations uponits teeth; the provision of an improved arrangementfor giving the bar and grinding-wheel the relative movement necessary forsecuring the engagement of the wheel with the surfaces to be ground; and the provision of means whereby the side faceof the grinding wheel may be utilized for the grinding operation, thus relieving the edge or peripheral surface from'this work, so that; such peripheralsurface may be used for general work for a longer period than would otherwise be the case. One embodiment of the invention is illustrated in the accompanying drawings wherein:

Figure l is a plan "iew of the machine. Fig. 2. is a front elevation. Fig. 3 is an enlarged detail section on the linelIlII;IIT

of Fig. 1. Fig. 4 is a sectionon the line IVI'V of. Fig; 1. Fig, 5 is a plan View of the sickle holder shown in side elevation in Fig. 4:. Fig. 6 is a section on the line VIVI of Fig. l. And Fig. 7' 1s a section through the sickle holder corresponding to that of F ig, 6, but showing the sickle bar clamped in position inthe holder.

Referring-to the drawings, 1 is thebase plate of the machine adapted to rest upon the bench 2, upon which the machme is supported, being heldsecurely in position by means of the clamps 2, 2 (Fig. 2) extend bracket 19 (Fig.

ingbeneaththe bench, and provi'ded-with-the usual clampin screws3, 3. The base plate carries the gear casing 4 in which ism'ounted the spur gear 5'driven from the handle 6 carried by the shaft (Wthrough *theiin-termediary of suitable gearing-not shown and constituting no part of the present invention.

Extending transversely of thecasing. 4, and journaled therein is the spindle- 7, to one end of which is securedthe disc grinding wheel- 8 of the alundum, or other suitable abrading composition. This shaftcarlies the long pinion- 9 meshing with the gear 5, the shaft being slidable endw-ise in its bearings, and the long pinion giving driving engagement as the shaft is moved in an'doutf This arrangement permits offthe wmovement ofthe grinding wheel 8 upto and awa yxfrom the work; i. e., the sickle bar 10. This'movement is accomplished by means of the. lever 11 pivotedatits endtothe lug 12and carrying intermediateitsends a block 13 to which the outer end ofthe shaft 7 is swiveled.

The block 13- is pivoted: the lever 11 (Figs. 2-and 3) uponthescrewsH, 14, held against unscrewing by the cotterpins 15, 15;- The reduced end of the shaft 7 carriesithe bushing 16, with a nut 17"holding it in position, a wearring 18 being interposed between thenut and the faceof the block 13; 85

Mounted upon the base plate 1. is. the bracket lOwhichQcarries the sickle clampor holder 20. This'bracket is swiveled upon the threaded rod 21 (Figs. 1 and by means of which the bracket maybe-clamped in any desiredposition ofiangularadjustment. Thebaseplate is provided with a pair of upstandinglugs 22each carryinga step screw 23 adapted toengage theisurfaees 24, 25 on'the bracket. The sickle holder.- 20 is provided withintegral'lugs carryingthe bolts 26, 26' (Figs. 1 and/l)- supportedwby the vertical posts 27, 27 integral with the One of! the posts 27 has arearwardly projecting arm 28 provided with a thumb screw 29 adapted to; engage an arm 30 projectingrearwardly from the sickleholder, thus providing for an adjustment of the sickleholder upon thel-bolts 26, 26.

The sickleholder 20. comprises thezlon tudinally extending: main bar. :30? audit e clampin bar 31 also extending longitudinally therelwnea-th (Figs. 4 and Fig. 7 shows the sickle clamped in position between the bars 30 .and 31, such sickle comprising the supporting bar 32 and the blades 33 riveted thereto. The clamping bar is supported by the three bolts 3%, 34, 34 extending through the bar 30 with their heads 35,

35 supported upon the inclined surface 36, 36, 36 of the locking bar 37. This locking bar is operated by the lever 38, )ivoted at 39,

a movement of the lever to the right serving to move the bar 31 upward to clamp the sickle, and a movement to the left permitting a downward movement of such bar 31. The

bar 30 is also provided with a slotted lug 10 follows The operator first positions the sickle between the bars 30 and 31 and slides it along until the corner m (Fig. 1) of the grinding wheel comes in line with one of the 1" spaces y (Fig. 2) between the edges of a pair of blades. The sickle is then clamped by operating the handle 38 and the gage block l1 (Fig. 4) positioned against the inclined edge of one of the teeth, and clamped in position to serve as a guide in positioning the sickle for thegrinding operations which succeed the first one. At the time the V space i is brought into opposition to the corner w of the wheel, the bracket 19 carrying the sickle holder is swung around the screw rod 21 until it arrives at the proper angle, which is readily determined by the operator by mow ing the grinding wheel. in proximity to the surface of the blade which is to be ground first. Thescr w rod 21 is then tightened and'the stop or gage bolt 23 positioned in. contact with the surface 24 as illustrated, so that the position of adjustment of the bracket 19, when once determined is not lost upon loosening the screw rod. The final adjustment of the sickle holder about the bolts 26 'as an axis is accomplished by means of the thumb screw 29, the proper angle being readily determined by the operator upon bringing the grinding surface of the wheel in proximity to the surface of the blade which is to be ground.

The machine is now set for the first grinding operation, which is accomplished by the operator, who turns the handle 6 with his right hand and presses the lever 11 inward with his left hand, thus moving the grinding wheel inward until its side face adjacent its periphery engages the surface to be ground, the extent of grinding being determined by the amount the handle 11 is moved inward.

One edge of one of the blades now being ground, it becomes necessary to unclamp the sickle bar and re-position it for grinding the edge of the next blade. This is done by moving the lever 38 to the left, permitting the bar 31 to move down, after which the sickle is moved along the length of one of the plates 33, the exact position being fixed by having the edge of the next plate engage the gage block 41. The sickle is then clamped in position and the operation of grinding repeated. After the edges of the plates having the same inclination are ground, the bracket 19 is shifted about the pivot 21, so that the screw 23 engages the surface 25, and thesurfaces on the sickle to be ground approach the other side of the wheel at e. The other edges of the blades are then all ground following the procedure heretofore outlined for the first set of edges.

hen it is desired to use the machine for work other than the grinding of saw tooth sickles, the bracket 19 (with the parts car ried thereby) and the handle 11 are readily removed, and a collar secured to the outer end of the shaft 7 by means of a set screw to prevent inward movement of such shaft. The machine may also be used for many purposes without removing the sickle attachment devices, so that it is serviceable for general use.

What I claim is:

In combination, a frame including a horizontal plate adapted to rest upon a table or bench, and a. gear casing at right angles to said plate, a work spindle extending trans versely through the casing and mounted for rotative and longitudinal movement, lateral extensions at the sides of the casing acting as bearings for the spindle, a disc grinding wheel carried by the spindle on one side of the casing, a drive gear in the casing arranged so as to mesh with the pinion throughout the longitudinal movement of the spindle, a shaft carrying said gear and provided. with a turning crank and handle on the side of the casing remote from the grinding wheel, and a hand. lever pivoted at one-end to the casing above said c 'ank and having a rocking and swivel connection intermediate its ends with the end of. said spindle, said crank having its end carrying the handle bent outwardso as to clear said lever during its movement of rotation.

In testimony whereof, I have hereunto subscribed my name this 23rd day of June,

L. J. COONEY.

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